Question

How is the type of current used in household supply different from the one given by dry cells or storage batteries?

Answer 1

Step 1: Current used in household supply
The current used in household supplies is alternating current (AC). In AC, the direction of current changes periodically. The voltage alternates between positive and negative values, typically at a frequency of 50 or 60 Hz (depending on the country).

Step 2: Current provided by dry cells and storage batteries
Dry cells and storage batteries provide direct current (DC). In DC, the current flows in one direction only, maintaining a constant voltage.

Step 3: Key differences
1. Direction of current: AC alternates direction, while DC flows in one direction.
2. Source: AC is generated by power stations and supplied through power lines, while DC comes from sources like dry cells or storage batteries.
3. Use: AC is used for household appliances, while DC is typically used in portable devices and electronic circuits.

Conclusion:
AC (alternating current) is used in household supplies due to its ability to be easily transmitted over long distances, while DC (direct current) is used in dry cells and storage batteries for its stable, one-way flow of current.